There are entire series of Macs that will not boot in System 9. Nothing you do can make them start up in 9 but that doesn't matter. You can install 9.2.2 on a non-intel Mac and run System 9 programs. I have many clients who use Quark 5 on G4 and G5 Macs. They boot in OS 10.4 and run Quark in System 9.